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Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Surface wave dispersion in cement-based media. Inclusion size effect
This paper presents experimental data in the field of surface wave propagation through a strongly inhomogeneous medium with randomly distributed and oriented thin inclusions simulating cracks. Specifically, the study focuses on the influence of inclusion size. Thin plastic inclusions were embedded in a cementitious matrix to simulate distributed damage. The results demonstrate that the propagation behavior of cementitious material with simulated damage is far from homogeneous. For the same low inclusion volume fraction of 1 %, considerable discrepancies arise according to the size of the inclusions. These discrepancies concern the shape of time domain waveforms, the group and phase velocities of Rayleigh, as well as the longitudinal waves. Rayleigh waves are more sensitive to the inclusions than longitudinal since they undergo greater decrease and exhibit higher experimental variance, due to the locality of the medium. It seems that scattering is a crucial mechanism of propagation, since not only the volume fraction, but also the shape of the inclusions strongly influences wave propagation. However, both the constituent materials in this study have visco-elastic character. Therefore, the exact contribution of the different mechanisms can be characterized accurately only with the support of a theoretical model. The present study demonstrates the dispersive behavior of cementitious material that so far has been underestimated. It is seen that the influence of inhomogeneity shape and size, is apparently one of the reasons that make the establishment of a single relation between pulse velocity and damage of concrete troublesome. Nevertheless, exploitation of the characteristics of scattered waves can provide valuable information since inclusion or crack parameters like shape, size and content influence the time domain waveforms and the dispersion curves.
Surface wave dispersion in cement-based media. Inclusion size effect
This paper presents experimental data in the field of surface wave propagation through a strongly inhomogeneous medium with randomly distributed and oriented thin inclusions simulating cracks. Specifically, the study focuses on the influence of inclusion size. Thin plastic inclusions were embedded in a cementitious matrix to simulate distributed damage. The results demonstrate that the propagation behavior of cementitious material with simulated damage is far from homogeneous. For the same low inclusion volume fraction of 1 %, considerable discrepancies arise according to the size of the inclusions. These discrepancies concern the shape of time domain waveforms, the group and phase velocities of Rayleigh, as well as the longitudinal waves. Rayleigh waves are more sensitive to the inclusions than longitudinal since they undergo greater decrease and exhibit higher experimental variance, due to the locality of the medium. It seems that scattering is a crucial mechanism of propagation, since not only the volume fraction, but also the shape of the inclusions strongly influences wave propagation. However, both the constituent materials in this study have visco-elastic character. Therefore, the exact contribution of the different mechanisms can be characterized accurately only with the support of a theoretical model. The present study demonstrates the dispersive behavior of cementitious material that so far has been underestimated. It is seen that the influence of inhomogeneity shape and size, is apparently one of the reasons that make the establishment of a single relation between pulse velocity and damage of concrete troublesome. Nevertheless, exploitation of the characteristics of scattered waves can provide valuable information since inclusion or crack parameters like shape, size and content influence the time domain waveforms and the dispersion curves.
Surface wave dispersion in cement-based media. Inclusion size effect
Oberflächendispersion in Zement basierten Medien. Größeneffekte von Einschlüssen
Aggelis, D.G. (Autor:in) / Shiotani, T. (Autor:in)
NDT&E International ; 41 ; 319-325
2008
7 Seiten, 5 Bilder, 1 Tabelle, 31 Quellen
Aufsatz (Zeitschrift)
Englisch
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